Prescription glasses or optical grade glasses always have their model name and model number printed on the inside of either the right or left temple (arm) of the frame; model names and model numbers are not always printed in the same place.
In this post
What do the 3 numbers on glasses mean?
1) The eye size number (it is the size of the lenses on your frame). 2) The bridge size number (the distance between the lenses). 3) The temple length number (it is the size of that part of your eyeglass frame, which rests upon your ears).
How do I read my eyeglass code?
Your glasses size is made up of 3 numbers that indicate measurements in millimeters, such as “45 20-135.” The first number will be the eye size, which measures the width of 1 lens. The second number indicates the bridge width, or the distance between the lenses.
Why are there numbers on my lenses?
With the help of these engravings, the optician can determine where the fields of vision for distance, intermediate, and near are located and whether the progressive lens is optimally positioned in front of your eye.
What does 140 mean on glasses?
Eyeglass temple size is measured from the hinge of the frame to the end tip of the temple. In this case, the temple length is 140 mm.
What are the numbers on eyeglass frames?
The first number, 54, represents the lens width; the second number, 16, refers to the bridge size, while the last number, 140, is the temple length. Sometimes there is a fourth number that refers to the lens height. These numbers come in handy and can act as a reference for you to pick the frames that best fit you.
Is the PD number on glasses?
?Can I find my PD on my glasses? You usually can’t find your PD number written on your eyeglasses. The numbers on the inside of the temple arms of some frames show the measurements for the frame itself. Your PD number should be written on your eyeglass prescription in the PD section.
What does PD mean for glasses?
pupillary distance
What is pupillary distance? Simply stated, pupillary distance (PD) is the measurement of the distance between your two pupils, and it helps make sure you eyeglasses will fit and align correctly with the center of your eyes.
How do you tell if your glasses are progressive?
SPH- This is short for sphere, and basically tells you how powerful your prescription needs to be in order to correct your vision. If you happen to see the letters ADD, this is how much more power you need if you are getting bifocals or progressive lenses.
What size glasses 10 year old?
The two core frame dimenstions are always stated as two numbers.
How to choose the correct size glasses for your child.
| Child’s Age (Years) | Frame Size |
|---|---|
| 2.5 – 4 | 40 – 42 |
| 4 – 7 | 43 – 45 |
| 7 – 10 | 45 – 47 |
| 10 – 16 | 47 – 52 |
What does 135 glasses mean?
They’re measurements. The first number (e.g. 52), is the width of the lenses. The second number (e.g. 20) is the distance between the lenses. And the third number (e.g. 135) is the complete length of the temple arm, which includes the portion that goes behind your ear.
What does 55mm mean in glasses?
Temple length
| Fit | Eyeglasses | Sunglasses |
|---|---|---|
| Small | 50mm and below | 55mm and below |
| Medium | 51mm–54mm | 56mm–64mm |
| Large | 55mm and above | 65mm and above |
What’s the difference between 52 and 54 glasses?
Lens width is measured from left to right at the widest point in the lens. Between a 52 and 54 eyesize, the 54 will have a wider lens so the whole frame will be wider too. The lens will also be a little taller to preserve the shape. The bridge and temple measurements will usually remain the same.
What size is 55 in glasses?
Glasses Frames- How to choose the right size eye glass frames.
| Small | 44-47mm |
|---|---|
| Medium | 49-52mm |
| Medium Large | 52-54mm |
| Large | 54-56mm |
| Extra Large | 56mm and up |
Why is my PD not on my prescription?
Some offices will put the PD measured by some of the instrumentation during your exam on the prescription and others will have the optician take that measurement for you. The doctor during your exam does not take your PD at anytime during your exam, as that is left to the optician who is going to make your eyewear.
What happens if PD is off on glasses?
If your PD is off, the “optical center” of your lenses will be, too, and your glasses won’t be as effective as they should be. You also need your prescription. Lots of optometrists will give you a copy of your prescription but not include your PD.
Does your PD change over time?
Your PD automatically adjusts during the day, as your eyes move between different viewing distances. Fortunately, when ordering glasses including progressive designs, only the distance PD is necessary as standard adjustments are made to accommodate for reading or computer vision.
Is a PD of 70 normal?
The average adult PD range is between 54-74 mm. The average child PD range is between 43-58 mm. A dual PD is provided with two numbers and represents the measurement of each pupil center to the center of the bridge of your nose in millimeters.
Should I round my PD up or down?
I would round up, myself, because those gadgets measure at what doctors refer to as “optical infinity” and that usually works out to around 20 feet. I found that rounding my own value up, makes the glasses MUCH more comfortable.
Why are progressives blurry on the sides?
They are blurry on the sides by design. It’s an error called surface astigmatism that is present in all progressive lenses. Blurred peripheral vision is not necessarily a sign that you need to get them fitted again.
What is better bifocals or progressive lenses?
Progressive lenses provide the most natural vision for the wearer by seamlessly transitioning between near and far prescriptions within the lens. Whereas, a bifocal lens is separated into distinct areas of near-and-far-vision prescriptions.